export default {
	//命名空间
	namespaced: true,

	state: () => ({
		//购物车数组，用来存储购物车中每个商品的信息对象
		// cart:[]
		// 对象属性 goods_id goods_name goods_price goods_count goods_small_logo goods_state	
		cart: JSON.parse(uni.getStorageSync('cart') || '[]')

	}),



	//模块内mutations方法
	mutations: {
		addToCart(state, goods) {
			const findResult = state.cart.find(x => x.goods_id === goods.goods_id)

			if (!findResult) {
				state.cart.push(goods)
			} else {
				findResult.goods_count++
			}

			this.commit('m_cart/saveToStorage')
		},
		//将数据持久化
		saveToStorage(state) {
			console.log("saveToStorage")
			uni.setStorageSync('cart', JSON.stringify(state.cart))
		},

		updateGoodsState(state, goods) {
			const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
			if (findResult) {
				findResult.goods_state = goods.goods_state
				this.commit('m_cart/saveToStorage')
			}
		},
		updateGoodsCount(state, goods) {
			const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
			if (findResult) {
				findResult.goods_count = goods.goods_count

				this.commit('m_cart/saveToStorage')
			}
		},
		removeGoodsById(state, goods_id) {
			state.cart = state.cart.find(x => x.goods_id !== goods_id)
			this.commit('m_cart/saveToStorage')
		},
		
		//更新购物车中所有反选的状态
		updateAllGoodsState(state,newState){
			state.cart.filter(x => x.goods_state = newState)
			this.commit('m_cart/saveToStorage')
		},
		
		
	},

	//模块内getter属性 

	getters: {
		//统计购物车商品总数
		total(state) {
			// let c = 0
			// //循环统计商品数量，统计到变量c
			// state.cart.forEach(x => c += x.goods_count)
			// return c
			return state.cart.reduce((total,item) => total += item.goods_count,0)
		},
		
		
		//已勾选商品数量
		checkedCount(state) {
			return state.cart.filter(x => x.goods_state).reduce((total, item) => total += item.goods_count, 0)
		},
		
		//已勾选商品的总价
		checkedGoodsAmount(state){
			return state.cart.filter(x => x.goods_state)
			.reduce((amount,item)=> amount + item.goods_count * item.goods_price,0).toFixed(2)
			
		}
	},


}
